<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>实体字符</title>
	</head>
	<body>
		
		html页面的根标签是___&lt;html&gt;_&lt;/html&gt;_______
		&lt;的字符实体是&amp;lt;
		
		勾的实体字符 &radic;
	</body>
</html>
